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Process for deoxidation smelting of aluminum-bearing steel by means of silicon carbide

A silicon carbide and process technology, which is applied in the field of iron and steel metallurgy to achieve the effects of optimizing the slag-making system, good quality of cast slabs, and obvious effects.

Active Publication Date: 2016-04-06
NANJING IRON & STEEL CO LTD
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Problems solved by technology

However, there is a conflict between the need for aluminum and the reduction of aluminum use in aluminum-containing steels

Method used

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  • Process for deoxidation smelting of aluminum-bearing steel by means of silicon carbide
  • Process for deoxidation smelting of aluminum-bearing steel by means of silicon carbide
  • Process for deoxidation smelting of aluminum-bearing steel by means of silicon carbide

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Embodiment 1

[0015] A control process for the production of aluminum-containing steel by silicon carbide deoxidation in the smelting process provided by this embodiment, such as figure 1 As shown, the process is optimized through the converter tapping deoxidation system and slagging system. The converter tapping is added with an appropriate amount of silicon carbide according to the oxygen value at the end point. In the process of aluminum steel, the aluminum content in the molten steel is kept in the range of 0.030-0.040% to control the feeding amount of aluminum wire, and softly stir for more than 10 minutes after desulfurization and alloying.

[0016] In this embodiment, A516Gr70 steel grade is selected, and it is smelted in a 150-ton converter and a 150-ton ladle furnace. The chemical composition of A516Gr70 is shown in Table 1, and the entire smelting process is controlled as follows:

[0017] Table 1S355J-1 main chemical composition (%)

[0018]

[0019] (1) Converter blowing. ...

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Abstract

The invention relates to a process for deoxidation smelting of aluminum-bearing steel by means of silicon carbide. The process comprises the steps of molten iron desulphurization pretreatment, converter smelting, tapping deoxidation slagging alloying, LF refining furnace slagging deoxidation and desulphurization, soft stirring and continuous casting; and in the step of converter smelting, deep desulphurization operation, slag blocking operation and tapping deoxidation are included, an LF furnace carries out aluminum wire deoxidation slagging fast in the early stage by means of optimization of a converter tapping deoxidation system and a slagging system, and by means of the process of finely adjusting aluminum in molten steel through an aluminum wire to produce the aluminum-bearing steel, diffusion deoxidation and sediment deoxidation in the smelting process are reasonably combined. According to the process, converter tapping deoxidation is stable, the LF furnace slagging desulphurization effect is remarkable, the quality of a casting blank is good, and the process technology that consumption of ton steel aluminum for producing the aluminum-bearing steel is lowered by 0.53 kg is achieved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a process for smelting aluminum-containing steel through silicon carbide deoxidation. Background technique [0002] The deoxidation system in the smelting process is the key process for producing high-quality steel. As the most common active deoxidizer in the steelmaking process, aluminum is widely used in major steelmaking plants. Especially in the production of aluminum-containing steel, aluminum is used not only as a deoxidizer, but also as one of the alloying elements in molten steel, resulting in the consumption of about 2kg of aluminum per ton of steel in the production process of aluminum-containing steel, which increases production costs and reduces The economic benefits of steel manufacturers. With the downturn in the steel market, reducing production costs has become the main way for various steel companies to increase their profits. Redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02C21C5/28C21C7/06C21C7/064
CPCY02P10/20
Inventor 曹余良王攀峰周桂成张小伟吴国平
Owner NANJING IRON & STEEL CO LTD
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